Photon analog-to-digital conversion method and converter based on wavelength multiplexing and optical trapping

Abstract

A kind of photonic analog-digital conversion method based on wavelength multiplexing and optical capture, utilizes wavelength division multiplexer to compound N different wavelength continuous light into a road, simultaneously loads sampled analog signal on N light paths, then makes analog signal on different wavelength light path obtain different delay amount by delay control module, and the delay amount difference of adjacent two paths is equal, and utilizes optical capture unit to realize time domain discretization of N equal time interval analog signals.The present application effectively reduces the complexity and link loss of system, improves stability, doubles the sampling rate of photonic analog-digital conversion system, and has the ability of easy large-scale expansion.Based on the method, high-speed and high-precision on-chip photonic analog-digital conversion system can be realized.

Description

Technical Field

[0001] This invention relates to photonic information processing technology, specifically a photonic analog-to-digital conversion method and converter based on wavelength multiplexing and optical trapping. Background Technology

[0002] With the increasing complexity of today's electromagnetic environment and the ever-expanding frequency coverage, electronic information systems require a technology to receive and analyze high-bandwidth signals in order to search, intercept, locate, and analyze them. High-bandwidth analog signals are prone to noise during transmission and processing, leading to signal distortion. Therefore, it is often necessary to first convert analog signals into digital signals. Meanwhile, digital signal processing technology offers numerous advantages such as high flexibility, speed, and reliability, leading researchers to increasingly favor performing information processing in the digital domain. Analog-to-digital converters (ADCs) can transform analog signals from nature into time- and amplitude-discrete digital signals, facilitating signal transmission and processing. Although ADCs constitute only a small part of a signal processing system, they are a key functional module affecting the overall system performance. Currently, for every doubling of the sampling rate in electronic ADC technology, the quantization accuracy decreases by approximately 1 bit. Existing electronic ADC technology is approaching its performance limits and cannot meet the demands of future applications, becoming a bottleneck restricting the performance of signal processing systems. In fields such as broadband radar, electronic warfare, and real-time monitoring of high-energy physics, there is an urgent need for high-sampling-rate and high-precision analog-to-digital converters, which indicates that new technological innovations are needed in the field of analog-to-digital conversion.

[0003] With the continuous development of mode-locked lasers, electro-optic modulators, and all-optical quantization coding technology, researchers have overcome the bottleneck of electronic analog-to-digital conversion (ADC) technology by utilizing photonic analog-to-digital conversion (A / D) technology, achieving high-speed signal A / D conversion. The mainstream approach is the optical sampling-electro-quantization A / D conversion system. This approach uses optical pulses generated by a laser to sample analog electrical signals. The resulting optical signals are converted into electrical signals by a high-speed photodetector, and then converted into analog signals by the quantizer in the electronic A / D converter. Since the operating frequency of the electronic A / D converter is lower than the repetition frequency of the optical pulses, the optical sampling-electro-quantization A / D conversion system also needs to utilize time-division multiplexing (TDM) and wavelength-division multiplexing (WDM) techniques to achieve multi-channel speed-down processing of high-speed optical pulses. In the process of multi-channel de-slowing optical pulses, it is usually necessary to use multiple electro-optic modulators for step-by-step de-slowing [Juodawlkis, Paul W., et al., “Optically sampled analog-to-digital converters.” IEEE Transactions on Microwave Theory and Techniques Vol. 49, No. 10, 1840-1853, 2001.] or to use multiple wavelength channels of broadband ultrashort optical pulses for de-slowing [A. Khilo, et al., “Photonic ADC: overcoming the bottleneck of electronicjitter.” Optics Express. Vol. 20, No. 4, 4454-4469, 2012.]. These optical pulse de-slowing methods greatly increase system complexity, degrade signal quality, and reduce conversion accuracy. Meanwhile, in the process of on-chip integration of photonic analog-to-digital conversion systems, practice has shown that the previous complex multi-channel de-slowing methods require a large number of optoelectronic devices, resulting in complex systems that are difficult to integrate. Broadband ultrashort optical pulses also lack mature on-chip solutions. The above analysis shows that as photonic analog-to-digital conversion technology develops towards high speed, high precision, and miniaturization, there is an urgent need to improve the design methods of photonic analog-to-digital conversion systems and simplify system complexity. Summary of the Invention

[0004] This invention proposes a photonic analog-to-digital conversion (A / D) method based on wavelength multiplexing and optical trapping. It utilizes a wavelength division multiplexer (WDM) to combine N continuous light sources of different wavelengths into a single path, while simultaneously loading sampled analog signals onto these N paths. A delay control module then ensures that the analog signals on different wavelength paths have varying delays, with equal delay differences between adjacent paths. Furthermore, an optical trapping unit discretizes the N equally timed analog signals in the time domain. This method flexibly utilizes passive components such as WDMs, significantly reducing the number of active components like electro-optic modulators, effectively lowering system complexity and link loss, thereby improving the performance of the photonic A / D conversion system. Simultaneously, replacing active components with passive ones effectively reduces system power consumption and improves stability. This method can also significantly increase the sampling rate of the photonic A / D conversion system by simply configuring the number of continuous laser sources and the number of channels in the WDM / demultiplexer, making it easily scalable. Based on this method, a high-speed, high-precision on-chip photonic A / D conversion system can be achieved.

[0005] The technical solution of the present invention is as follows:

[0006] On one hand, the present invention provides a photon analog-to-digital conversion method based on wavelength multiplexing and optical trapping, comprising the following steps:

[0007] The received N continuous optical signals of different wavelengths are combined into one stable continuous optical signal of N wavelengths, and the sampled analog signal source is simultaneously loaded onto the continuous optical signals of different wavelengths, where N≥2;

[0008] Different delays are obtained for analog signals on optical paths of different wavelengths, and the delay difference between adjacent paths is equal; and

[0009] Simultaneously, after time-domain discretization of the sampled signals loaded at different wavelengths, the N signals of different wavelengths are further divided into N optical signals according to wavelength.

[0010] It also includes the following steps:

[0011] The received N optical signals are converted into N electrical signals.

[0012] The N-channel electrical signals are converted into N-channel digital electrical signals, and the data is reconstructed, interleaved, and processed to obtain the original analog electrical signal information.

[0013] The N continuous optical signals of different wavelengths are generated by a continuous laser source array.

[0014] The sampled signal source is an electrical analog signal generated by a voltage-controlled oscillator, a frequency synthesizer, an analog signal generator, or an arbitrary waveform generator.

[0015] Furthermore, the method of obtaining different delay amounts for analog signals on different wavelength optical paths, with equal delay differences between adjacent paths, specifically includes the following steps:

[0016] By decomposing the optical signal into N optical signals of different wavelengths, each carrying the same sampled signal;

[0017] The relative delay of each channel is controlled to be 1 / Nfs, where the nth delay is (n-1) / Nfs, so that each of the same N sampled signals is staggered by 1 / Nfs in the time domain. Here, n = 1, 2, 3...N, fs is the optical acquisition frequency; and...

[0018] The N continuous optical signals carrying the sampled signal are combined into one.

[0019] Furthermore, the simultaneous time-domain discretization of the sampled signals loaded at different wavelengths specifically includes the following steps:

[0020] A sequence of optical sampling pulses with amplitude modulated by the sampled signal is generated at a frequency of fs to achieve time-domain discretization of the sampled signal loaded with different wavelengths.

[0021] On the other hand, the present invention also provides a photonic analog-to-digital converter based on wavelength multiplexing and optical trapping, comprising:

[0022] A continuous laser source array generates N continuous laser sources with different wavelengths and transmits them to a wavelength division multiplexer;

[0023] A wavelength division multiplexer is used to combine N continuous light source signals of different wavelengths into a single continuous optical signal containing N wavelengths.

[0024] A modulator is used to simultaneously modulate a sampled analog signal onto a continuous optical signal of different wavelengths;

[0025] The delay control module is used to obtain different delay amounts for analog signals on different wavelength optical paths, and the delay difference between adjacent paths is equal.

[0026] An optical acquisition module is used for time-domain discretization of sampled signals loaded at different wavelengths; and

[0027] A wavelength demultiplexer is used to divide a single signal of N different wavelengths, which has been synchronously time-domain discrete, into N separate channels according to wavelength.

[0028] Furthermore, it also includes:

[0029] A photodetector array is used to convert N received optical signals into N electrical signals and transmit them to an electronic analog-to-digital converter array.

[0030] An electronic analog-to-digital converter array is used to convert N received electrical signals into N electrical digital signals and transmit them to a data integration and processing module; and

[0031] The data integration and processing module is used to reconstruct, interleave, and process the received N channels of digital electrical signals to obtain the original analog electrical signal information.

[0032] Preferably, the delay control module includes a delay wavelength demultiplexer, a delay line array composed of N delay line units, and a delay wavelength division multiplexer.

[0033] The aforementioned time-delay wavelength division multiplexer decomposes the optical signal into N optical signals of different wavelengths but carrying the same sampled signal. These signals are then input into N time-delay line units of the time-delay line array. The relative delay of each of the N time-delay line units is controlled to be 1 / Nfs, where the delay generated by the nth time-delay line unit is (n-1) / Nfs. This ensures that each of the N sampled signals is staggered by 1 / Nfs in the time domain. The N continuous optical signals carrying the sampled signal are then combined into one by the time-delay wavelength division multiplexer, where n = 1, 2, 3...N, and fs is the optical acquisition frequency.

[0034] Preferably, the photodetector array is composed of N PD units arranged in parallel, so that N optical signals are converted into N electrical signals by the N PD units respectively; the electronic analog-to-digital converter array is composed of N electronic analog-to-digital converters arranged in parallel, so that N electrical signals are converted into N digital signals by the N electronic analog-to-digital converters respectively.

[0035] Preferably, the continuous laser source, as the optical carrier of a photonic analog-to-digital conversion system based on wavelength multiplexing and optical trapping, may be, but is not limited to, a solid-state laser, a gas laser, a liquid laser, a semiconductor laser, a free-electron laser, or a fiber laser.

[0036] Preferably, the wavelength division multiplexer is used to combine continuous lasers of different wavelengths into one channel, and can be, but is not limited to, fused taper fiber type wavelength division multiplexer, interference filter type wavelength division multiplexer, diffraction grating type wavelength division multiplexer, integrated optical waveguide type wavelength division multiplexer, etc.

[0037] Preferably, the sampled signal source is an electrical analog signal generated by a voltage-controlled oscillator, frequency synthesizer, analog signal generator, or arbitrary waveform generator.

[0038] Preferably, the electro-optic modulator is used to modulate the sampled signal source onto the optical carrier, and may be, but is not limited to, a lithium niobate electro-optic modulator, a polymer electro-optic modulator, a silicon-based integrated electro-optic modulator, an acousto-optic modulator, or a spatial light modulator.

[0039] Preferably, the delayed wave demultiplexer is used to decompose one optical path into different wavelength channels, and can be, but is not limited to, a fused taper fiber type wave demultiplexer, an interference filter type wave demultiplexer, a diffraction grating type wave demultiplexer, an integrated optical waveguide type wave demultiplexer, etc.

[0040] Preferably, the delay line unit is used to generate a delay amount with a defined optical path length, and may be an optical fiber, optical waveguide, or adjustable delay line of a defined length, etc.

[0041] Preferably, the time-delay wavelength division multiplexer is used to combine optical signals of different wavelengths into one channel, and can be, but is not limited to, fused taper fiber type wavelength division multiplexer, interference filter type wavelength division multiplexer, diffraction grating type wavelength division multiplexer, integrated optical waveguide type wavelength division multiplexer, etc.

[0042] Preferably, the optical capture module is used to discretize the sampled signal modulated onto the optical carrier in the time domain, and may employ, but is not limited to, a cascaded modulator or an optical microcavity.

[0043] Preferably, the wave demultiplexer is used to decompose a single optical path into different wavelength channels, and may be, but is not limited to, a fused taper fiber type wave demultiplexer, an interference filter type wave demultiplexer, a diffraction grating type wave demultiplexer, an integrated optical waveguide type wave demultiplexer, etc.

[0044] Preferably, the PD unit is used to convert optical signals into electrical signals, and may be, but is not limited to, PIN diodes, APD diodes, silicon-germanium photodetectors, etc.

[0045] Preferably, the electronic analog-to-digital converter is used to quantize and encode electrical signals, and can be, but is not limited to, an oscilloscope, an ADC chip, or a signal development board.

[0046] Preferably, the data integration and processing module is used for data reconstruction, interleaving, and processing of electronic digital signals, and may be, but is not limited to, computers, microcontrollers, information processing boards, etc.

[0047] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0048] 1) The photonic analog-to-digital conversion method proposed in this invention significantly reduces the number of active devices such as electro-optic modulators in traditional photonic analog-to-digital conversion systems by combining passive devices such as continuous laser source arrays and wavelength division multiplexers. This effectively reduces system complexity and link loss, thereby improving the performance of the photonic analog-to-digital conversion system.

[0049] 2) The photonic analog-to-digital conversion system proposed in this invention is based on a continuous laser source array and wavelength multiplexing method, which reduces the number of active devices in traditional photonic analog-to-digital conversion systems, can significantly reduce the heat generation of the photonic analog-to-digital conversion system, effectively reduce the total power consumption of the system, and improve the stability of the photonic analog-to-digital conversion system.

[0050] 3) The photonic analog-to-digital conversion system proposed in this invention is based on a continuous laser source array and wavelength multiplexing method. By simply increasing the number of continuous laser sources in the continuous laser source array and the number of channels of the wavelength division multiplexer / demultiplexer, the sampling rate of the photonic analog-to-digital conversion system can be increased several times while the single-channel sampling rate of the back-end electronic analog-to-digital converter is fixed. It has the ability to be easily scaled up on a large scale. Attached Figure Description

[0051] Figure 1(a) is an overall architecture diagram of an embodiment of the photon analog-to-digital conversion method based on wavelength multiplexing and optical trapping of the present invention, and Figure 1(b) is an architecture diagram of the delay control module;

[0052] Figure 2(a) is a schematic diagram of N continuous light source signals of different wavelengths generated by the continuous laser source array; Figure 2(b) is the output of the delay control module of N different wavelengths (λ1, λ2, λ3, ..., λ...). N Figure 2(c) shows a schematic diagram of optical signals at equal time intervals; Figure 2(c) shows the optical acquisition module generating a sequence of optical sampling pulses at a frequency of fs, the amplitude of which is modulated by the sampled signal, thereby realizing the sampling of N different wavelengths (λ1, λ2, λ3, ..., λ...). N Figure 2(d) is a schematic diagram of the time-domain discretization of optical signals. It is a schematic diagram of the N-channel electrical digital signals output by the electronic analog-to-digital converter array being reconstructed and interleaved by the data integration and processing module to restore the original electrical analog signal information. Detailed Implementation

[0053] A specific embodiment of the present invention is given below with reference to the accompanying drawings. This embodiment is implemented based on the technical solution of the present invention, and provides detailed implementation methods and processes, but the scope of protection of the present invention is not limited to the following embodiment.

[0054] Please refer to Figure 1(a). Figure 1(a) is an overall architecture diagram of an embodiment of the photonic analog-to-digital conversion method based on wavelength multiplexing and optical capture of the present invention. As shown in the figure, the photonic analog-to-digital conversion method based on wavelength multiplexing and optical capture of the present invention includes a continuous laser source array 1, a wavelength division multiplexer 2, a sampled signal source 3, an electro-optic modulator 4, a delay control module 5, an optical capture module 6, a wavelength demultiplexer 7, a photodetector array 8, an electronic analog-to-digital converter array 9, and a data integration and processing module 10. The continuous laser source array 1 is composed of N continuous laser sources 1-1 of different wavelengths. The delay control module 5 is composed of a delay wavelength demultiplexer 5-1, a delay line array 5-2, and a delay wavelength division multiplexer 5-3. The delay line array 5-2 is composed of N delay line units 5-2-1. The photodetector array 8 is composed of N PD units 8-1 arranged in parallel. The electronic analog-to-digital converter array 9 is composed of N electronic analog-to-digital converters 9-1 arranged in parallel. The N output terminals of the continuous laser source array 1 are respectively connected to the N input terminals of the wavelength division multiplexer 2. The multiplexing output terminal of the wavelength division multiplexer 2 is connected to the first input terminal of the electro-optic modulator 4. The sampled signal source 3 is connected to the second input terminal of the electro-optic modulator 4. The output terminal of the electro-optic modulator 4 is connected to the input terminal of the delay wavelength division multiplexer 5-1 in the delay control module 5. The N output terminals of the delay wavelength division multiplexer 5-1 in the delay control module 5 are respectively connected to the input terminals of the N delay line units 5-2-1 in the delay line array of the delay control module 5. The output terminals of the N delay line units 5-2-1 are respectively connected to the N input terminals of the delay wavelength division multiplexer 5-3 in the delay control module 5. The output of the delay wavelength division multiplexer 5-3 in the delay control module 5 is connected to the input of the optical acquisition module 6. The output of the optical acquisition module 6 is connected to the input of the wavelength division multiplexer 7. The N outputs of the wavelength division multiplexer 7 are respectively connected to the inputs of the N PD units 8-1 in the photodetector array 8. The outputs of the N PD units 8-1 in the photodetector array 8 are respectively connected to the inputs of the N electronic analog-to-digital converters 9-1 in the electronic analog-to-digital converter array 9. The outputs of the N electronic analog-to-digital converters 9-1 in the electronic analog-to-digital converter array 9 are respectively connected to the N inputs of the data integration and processing module 10, where N is a positive integer greater than or equal to 2.

[0055] The above-mentioned photon analog-to-digital conversion method based on wavelength multiplexing and optical trapping includes the following steps:

[0056] 1) As shown in Figure 2(a), the continuous laser source array 1 generates N continuous light source signals of different wavelengths, which are input to the wavelength division multiplexer 2. The wavelength division multiplexer 2 outputs a stable continuous optical signal containing multiple wavelengths, which is input to the optical input port of the electro-optic modulator 4. The sampled signal source 3 generates a sampled signal, which is input to the radio frequency input port of the electro-optic modulator 4. Each wavelength of light is simultaneously loaded with the same electrical analog signal, and then input to the delay control module 5.

[0057] 2) In the delay control module 5, the delay wavelength division multiplexer 5-1 decomposes the optical signal into N optical signals of different wavelengths but carrying the same sampled signal. These signals are then input to the N delay line units 5-2-1 of the delay line array 5-2, controlling the relative delay of each of the N delay line units 5-2-1 to be 1 / Nfs. The delay amount generated by the nth delay line unit is (n-1) / Nfs. This causes the originally identical N sampled signals to be staggered by 1 / Nfs in the time domain, as shown in Figure 2(b). These N continuous optical signals carrying the sampled signal are then combined into one by the wavelength division multiplexer 5-3 in the delay control module 5. Here, n = 1, 2, 3…N, and fs is the optical capture frequency.

[0058] 3) The output light from the delay control module 5 enters the optical capture module 6. The optical capture module 6 generates a sequence of light sampling pulses with amplitude modulated by the sampled signal at a frequency of fs, thereby realizing the time-domain discretization of the sampled signal loaded with different wavelengths, as shown in Figure 2(c). The time-domain discretized optical signal is then divided into N paths according to wavelength by the wavelength demultiplexer 7;

[0059] 4) The N time-domain discretized optical signals are converted into N electrical signals by N PD units 8-1. The N electrical signals are converted into N electrical digital signals by N electronic analog-to-digital converters 9-1 and then input into the data integration and processing module 10. The data integration and processing module 10 reconstructs and interleaves the received N electrical digital signals and processes them to obtain the original electrical analog signal information, as shown in Figure 2(d).

[0060] In the above process, photonic analog-to-digital conversion based on wavelength multiplexing and optical capture is completed through N-channel combined continuous laser sources of different wavelengths, equal time interval delay allocation, and optical capture module, realizing photonic analog-to-digital conversion of the actual total sampling rate N*fs of the sampled signal source.

[0061] Experiments show that the photonic analog-to-digital conversion (A / D) method of this invention, based on wavelength multiplexing and optical trapping, reduces the number of active devices such as electro-optic modulators by leveraging mature wavelength division multiplexing / demultiplexing (WDM) technology. This lowers the complexity and link loss of the photonic A / D conversion system, improves conversion accuracy, and reduces system power consumption and stability by replacing active devices with passive ones. This invention can significantly increase the sampling rate of the photonic A / D conversion system by simply increasing the number of continuous laser sources and the number of channels in the WDM / demultiplexer, and it is easily scalable. This invention proposes a novel photonic A / D conversion method that provides a reliable technical solution for realizing high-speed, high-precision on-chip photonic A / D conversion systems in the future.

Claims

1. A photonic analog-to-digital conversion method based on wavelength multiplexing and optical trapping, characterized in that, Including the following steps: The received N continuous optical signals of different wavelengths are combined into one stable continuous optical signal of N wavelengths, and the sampled analog signal source is simultaneously loaded onto the continuous optical signals of different wavelengths, where N≥2; Different delays are obtained for analog signals on optical paths of different wavelengths, and the delay difference between adjacent paths is equal; and Simultaneously, after performing time-domain discretization on the sampled signals loaded at different wavelengths, the N signals of different wavelengths are further divided into N optical signals according to wavelength. It also includes the following steps: The received N optical signals are converted into N electrical signals. The N-channel electrical signals are converted into N-channel digital electrical signals, and the data is reconstructed, interleaved, and processed to obtain the original analog electrical signal information. The method of obtaining different delay amounts for analog signals on different wavelength optical paths, with equal delay differences between adjacent paths, specifically includes the following steps: By decomposing the optical signal into N optical signals of different wavelengths, each carrying the same sampled signal; The relative delay of each channel is controlled to be 1 / Nfs, where the nth delay is (n-1) / Nfs, so that each of the same N sampled signals is staggered by 1 / Nfs in the time domain, where n=1, 2, 3...N, and fs is the optical acquisition frequency; and The N consecutive optical signals carrying the sampled signal are combined into one signal again; The simultaneous time-domain discretization of the sampled signals loaded at different wavelengths includes the following steps: A sequence of optical sampling pulses with amplitude modulated by the sampled signal is generated at a frequency of fs to achieve time-domain discretization of the sampled signal loaded with different wavelengths; fs is the optical capture frequency.

2. The wavelength division multiplexing and optical trapping based photonic analog-to-digital conversion method of claim 1, wherein, The N-channel continuous optical signals of different wavelengths are generated by a continuous laser source array (1).

3. The wavelength division multiplexing and optical trapping based photonic analog-to-digital conversion method of claim 1, wherein, The sampled signal source is an electrical analog signal generated by a voltage-controlled oscillator, a frequency synthesizer, an analog signal generator, or an arbitrary waveform generator.

4. A photonic analog-to-digital converter based on wavelength multiplexing and optical trapping, characterized in that, The photonic analog-to-digital converter is sequentially connected to a continuous laser source array (1), a wavelength division multiplexer (2), an electro-optic modulator (4), a delay control module (5), an optical capture module (6), and a wavelength division multiplexer (7). The sampled analog signal (3) is connected to the electro-optic modulator (4). A continuous laser source array (1) is used to generate N continuous laser sources (1-1) with different wavelengths and transmit them to a wavelength division multiplexer (2). Wavelength division multiplexer (2) is used to synthesize N continuous light source signals of different wavelengths into one continuous optical signal containing N wavelengths; An electro-optic modulator (4) is used to simultaneously modulate the sampled analog signal (3) onto continuous optical signals of different wavelengths; The delay control module (5) is used to obtain different delay amounts for analog signals on different wavelength optical paths, and the delay difference between adjacent paths is equal. An optical capture module (6) is used for time-domain discretization of sampled signals loaded with different wavelengths; as well as Wavelength demultiplexer (7) is used to divide a single signal with N different wavelengths sampled by a synchronous pulse into N channels according to wavelength; Also includes: A photodetector array (8) is used to convert the received N optical signals into N electrical signals and transmit them to an electronic analog-to-digital converter array (9). An electronic analog-to-digital converter array (9) is used to convert the received N electrical signals into N digital electrical signals and transmit them to the data integration and processing module (10); and The data integration and processing module (10) is used to reconstruct and interleave the received N-channel digital electrical signals and process them to obtain the original analog electrical signal information; The delay control module (5) includes a delay wavelength demultiplexer (5-1), a delay line array (5-2) consisting of N delay line units (5-2-1), and a delay wavelength division multiplexer (5-3). The delay wavelength division multiplexer (5-1) decomposes the optical signal into N optical signals of different wavelengths but carrying the same sampled signal, which are respectively input into the N delay line units (5-2-1) of the delay line array (5-2). The relative delay of each of the N delay line units (5-2-1) is controlled to be 1 / Nfs, where the delay amount generated by the nth delay line unit is (n-1) / Nfs, so that each of the N sampled signals is staggered by 1 / Nfs in the time domain. The N continuous optical signals carrying the sampled signal are combined into one by the delay wavelength division multiplexer (5-3), where n=1, 2, 3...N, and fs is the optical capture frequency.

5. The photonic analog-to-digital converter based on wavelength multiplexing and optical trapping according to claim 4, characterized in that, The photodetector array (8) is composed of N PD units (8-1) arranged in parallel, so that N optical signals are converted into N electrical signals by the N PD units (8-1); the electronic analog-to-digital converter array (9) is composed of N electronic analog-to-digital converters (9-1) arranged in parallel, so that N electrical signals are converted into N digital signals by the N electronic analog-to-digital converters (9-1).

6. The photonic analog-to-digital converter based on wavelength multiplexing and optical trapping according to claim 4, characterized in that, The optical capture module (6) is used to discretize the sampled signal modulated onto the optical carrier in the time domain by using a cascaded modulator or an optical microcavity.

7. The photonic analog-to-digital converter based on wavelength multiplexing and optical trapping according to claim 4, characterized in that, The continuous laser source (1-1) in the continuous laser source array (1) serves as the optical carrier of the photonic analog-to-digital converter based on wavelength multiplexing and optical trapping, and employs a solid-state laser, gas laser, liquid laser, semiconductor laser, free-electron laser or fiber laser.

8. The photonic analog-to-digital converter based on wavelength multiplexing and optical trapping according to claim 4, characterized in that, The wavelength division multiplexer (2) and wavelength division demultiplexer (7) are respectively a fused taper fiber type wavelength division multiplexer, an interference filter type wavelength division multiplexer, a diffraction grating type wavelength division multiplexer, or an integrated optical waveguide type wavelength division multiplexer; the time delay wavelength division demultiplexer (5-1) and time delay wavelength division multiplexer (5-3) are respectively a fused taper fiber type wavelength division demultiplexer, an interference filter type wavelength division demultiplexer, a diffraction grating type wavelength division demultiplexer, or an integrated optical waveguide type wavelength division demultiplexer.

9. The photonic analog-to-digital converter based on wavelength multiplexing and optical trapping according to claim 4, characterized in that, The electro-optic modulator is a lithium niobate electro-optic modulator, a polymer electro-optic modulator, or a silicon-based integrated electro-optic modulator.

10. The photonic analog-to-digital converter based on wavelength multiplexing and optical trapping according to claim 4, characterized in that, The delay line array (5-2) is used to generate a delay amount with a defined optical path length, using an optical fiber, optical waveguide or adjustable delay line of a defined length.

Images